#head{
    width: 1024px;
    height: 450px;
    background-image: url(123.jpg);
    margin: 0 auto;
    margin-top: 20px;
}
#bang {   
    width: 1024px;
    height: auto;
    margin: 0 auto;
}
#menu{
    width: 1024px;
    height: 35px;
    margin: 0 auto;
    margin-top: 0px;
    background: black ;
}
#a { padding: 0; margin:  0}
#a li{
    list-style-type:none;
    float: left;

}

#a  li a {

    text-decoration:none;
    width:129px;
    float:left;
    background:black;
    color: #cc0000;
    font-weight:bold;
    text-align:center;
    line-height:35px;
    margin: 0 auto;
}
#a li a:hover{
    background: #33ccff;}


#a li li {float: none;
}
#a li ul {
    display: none;
    margin: 0 ;
    padding: 0;
}

#a li:hover> ul {
    display: block;
    
}